石油地质与工程2025，Vol.39Issue(3)：16-22,7.
塔里木盆地顺9井区柯坪塔格组下段致密砂岩储层敏感性评价
Sensitivity evaluation of tight sandstone reservoir in the lower member of Kepingtage Formation in Shun-9 well area of Tarim Basin
摘要
Abstract
The tight sandstone reservoir of the Silurian Kalpintage Formation in Shun-9 well area of the Ta-rim Basin has a large burial depth,and is characterized by poor physical properties,relatively small pore-throat radii,etc.At present,the industry standards for the sensitivity evaluation are no longer applicable.Taking the lower sandstone reservoir of the Silurian Kepingtage Formation in the Shun-9 well area as the research object,an improved constant pressure fluid sensitivity experimental evaluation method is proposed.Nine representative samples from two wells are selected for velocity sensitivity,salt sensitivity,and acid sen-sitivity experimental evaluation.Research has found that the Kepingtage Formation in the Shun-9 well area belongs to a tight sandstone reservoir with ultra-low porosity and ultra-low permeability.The rock type is mainly lithic sandstone,and the reservoir space types are mainly primary pores,secondary pores,and frac-tures.The throat type is mainly a thin tube throat.The clay minerals are mainly composed of illite/smectite mixed layers,chlorite/smectite mixed layers,illite and chlorite.The tight reservoir in the study area has a moderately weak velocity sensitivity,a relatively low degree of salt sensitivity damage,and a relatively strong degree of acid sensitivity damage.By comparing the sensitivity evaluation methods of various types,it is confirmed that the improved constant pressure displacement method can solve the problem of exceeding the pressure gradient of constant velocity displacement in reservoir sensitivity evaluation standards,reduce experimental errors,be easy to operate,and have high feasibility.The types and contents of clay minerals,pore structure,and physical property characteristics are the main factors causing the reservoir sensitivity in the study area.The research results provide an important basis for the development of tight sandstone reser-voirs in this region.关键词
塔里木盆地/柯坪塔格组/储层敏感性/致密砂岩/恒压驱替法Key words
Tarim Basin/Kalpintage Formation/reservoir sensitivity/tight sandstone/constant pressure dis-placement method分类
石油、天然气工程引用本文复制引用
任泓宇,张晓宇,马冬晨,赵瑞明,成俊峰..塔里木盆地顺9井区柯坪塔格组下段致密砂岩储层敏感性评价[J].石油地质与工程,2025,39(3):16-22,7.基金项目
中石化西北油田分公司局控科研项目(KJ202210). （KJ202210）
